Manufacture of cement



11.935- M. VOGEL-JORGENSEN 8 r MANUFACTURE OF CEMENT Filed March '13,1934 INVENTOR Isl 07% Pirated Jam-22, 1935 I MANUFACTURE or CEMENTMikael Vogel-Jorgensen, Copenhagen, Denmark, assignor to F. L. Smidth &00., New York, N. Y., a corporation of New Jersey Application March 13,1934, Serial No. 715,264 In Great Britain July 25, 1933 1 Claim.

In the trea'ment of cement material, preliminary to the sintering of thesame in'kilns, it has been proposed heretofore to permit the rawmaterial, in the form of nodules or granules, to pass 5 between twovertical louvers through the openuniformity in the ultimate product itis desirable that the material iedto the space between the louversat'its top and descending between them shall move constantly at auniform rate. In the practical useof such apparatus it has been foundthat there is a tendency of the material, which necessarily is slightlymoist; to form a coating, especially on the upper plates of that louverbetween the plates of which the hot gases pass after they have passedthrough the material, which coating increases in thickness andeventually interferes with the free movement of the material andtherefore afiects unfavorably the quality of the ultimate product. Inanother application oi the present applicant, Serial No. 696,305 filedNovember 2, 1933, there is shown and described an apparatus, such asthat referred to, in which' it was sought to secure uniformity in themovement of the material between the two louvers by giving the louverplates, on their opposed working faces, a certain formation and also bygiving such plates a short reciprocatory movement in a generallyvertical direction. In the continued use of that apparatus it hasappeared-that the coat ing of the louver plates with the material is duein part at least to the lack of evaporation'of the moisture content ofthe nodules, the plates, and particularly the upper plates of the louverremote from the kiln, being relatively cool so that there is little orno evaporation of the contained moisture in the nodules. In thedevelopment of the present invention it has been found that evaporationof the contained moisture in the nodules can be promoted sufllciently toprevent the coating of the louver plates with which the material comesin contact and particularly the uppermost plates or the louver remotefrom the kiln by heating the platessomewhat, particularly as to theirworking faces, and in accordance with the invention provision is madewhereby hot gases from the kiln .or other heating medium are caused topass in contact with the uppermost louver plates, which otherwise wouldnot be heated sufllciently. In

the case of the uppermost plates oi the louver remote from the kilnthere would be but little contact with the hot gases before they passedto the stack. It has been found desirable to make such plates hollow andto provide means whereby hot gases from thekiln or other heating mediumare caused to pass, on their way-to the stack, between the two walls ofeach hollow plate.

The invention will be more fully explained hereinafter with reference tothe accompanying drawing, the single figure of which is a view invertical section of the improved structure, a portion-oi a rotary kilnbeing also shown.

In the embodiment of the invention illustrated the hot gases from thekiln 1 pass into a chamher 2 wherein is erected a double louveriorming apartition between the plates 3, 4--of which the material, deliveredthrough a hopper 2, descends by gravity passing from the double louverupon a plate 2 from which it may be discharged by a reciprocating pusher5 upon a chute 2 by which it is directed into the kiln. The louverplates 3,

4 maybe formed and arranged as shown and described in the applicationabove mentioned.

In order that a current of hot'gases from the kiln l or other heatingmedium may be brought into contact with the uppermost plates oi. thedouble louver, and particularly with the uppermost plates of the louverwall remote from the kiln, there is provided in the upper part 01' thechamber on the near side of the double louver an opening 8 which isconnected by a tube 8, shown in broken lines, with a header 8 which inturn is connected by distributor pipes 8 with the space between thewalls of hollow louverplates -'7. The

hot gases are thus brought in contact with the walls, with the workingfaces of which the material is brought in contact as it descends and thehot gases, after having heated the plates, pass from the open lowerendsof the spaces between the walls into the chamber on the remote side ofthe double louver and thence to the stack through an opening at 9.

It'has been found in practice that bysuch means the louver platesareheated sumciently to bring about such degree '0! evaporation of themoisture content of the material as to prevent a coating or the platesand thereby the movement I of the material downward between the louverwalls continues unaffected by accumulation of material on the workingfaces of the louver plates.

While the present invention is shown and described as embodied in astructure which has the characteristics or some of the characteristicsof the structure shown and described in the application above that thepresent invention is not restricted to use mentioned, it will beunderstood:

with that structure or to the particular construction and arrangement ofparts shown and de-' scribed herein, except as pointed out in theaccompanying claim.

I claim as my invention:

In a structure for the treatment of cement raw material with hot kilngases, the combination of a chamber, a double louver forming a partitionin the chamber, the chamber having an inlet on one side of the. doublelouver for the hot kiln gases and an outlet on the other side of thedouble louver for the escape of the gases and having also an opening onthe side of the double louver nearest the inlet for the hot gases, oneof the louver plates being hollow, a header in communication with thespace between the walls of the hollow plate, a tube connecting saidopening with said header, and means to supp y material to the spacebetween the louvers at their upper MIKAEL VOGEL-JORGENSEN.

